public async Task <IActionResult> Create(GradeDto gradeDto)
{
if (await _gradeService.GetGradeByNameAsync(gradeDto.GradeName.ToLower()) == false)
{
await _gradeService.AddAsync(_mapper.Map <Grade>(gradeDto));
ViewBag.ErrorMessage = "";
return(RedirectToAction("GetAll", "Grade"));
}
ViewBag.ErrorMessage = "Sistemde aynı isme ait sınıf bulunmaktadır...!";
return(View(gradeDto));
}